“This is an honest question but why with time being at a premium for testing was there a prerequisite to actually enter raid zones to help find bugs? I am not 100% sure that did Beta any favours.”

It was set on there to test the 75% requirement as that is new code that did not exist before this expansion. It used to be either only 1 person had access to enter or all had access to enter. Those were our only two options.

As far as testing goes, every single raid boss got testing (save for 2 which will be tested over the next few days) so, it didn't really need to be open at all.